Stoner will guest-star as the patient-of-the-week in the coming season’s second episode, airing September 27.

“I can’t tell you what’s wrong with me,” Stoner, 17, said when Fancast pressed for details on her character’s surely exotic condition. “You’ll have to tune in!”

This much Stoner did share: She trained to play a skateboarder who – presumably, knowing how the show’s opening minutes usually go – collapses while out, um, “shredding” (or whatever skateboarders might call it).